Can u help plz i need it quick

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)

These box plots show the number of electoral votes one by democratic and republican presidential candidates for the elections from 1984 through 2012. which statement best compares the spread of the data sets